Bicycle frame



FIG. 1 is a perspective view of a bicycle frame showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view;

FIG. 5 is a bottom view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a left side view thereof;

FIG. 8 is a cross-sectional view of the bicycle frame taken along line 8--8 of FIG. 6 illustrating the teardrop shape of the top tube;

FIG. 9 is a cross-sectional view of the bicycle frame taken along line 9--9 of FIG. 6 illustrating the teardrop shape of the down tube;

FIG. 10 is a cross-sectional view of the bicycle frame taken along line 10--10 of FIG. 6 illustrating the increased rounding out of the teardrop shape of the down tube adjacent to its ends;

FIG. 11 is a cross-sectional view of the bicycle frame taken along line 11--11 of FIG. 6 further illustrating the increased rounding out of the teardrop shape of the down tube adjacent to its ends;

FIG. 12 is a cross-sectional view of the bicycle frame taken along line 12--12 of FIG. 7 illustrating the round shape of the central portion of the seat tube;

FIG. 13 is a cross-sectional view of the bicycle frame taken along line 13--13 of FIG. 7 illustrating the increased ellipticity of the seat tube adjacent to its ends; and,

FIG. 14 is a cross-sectional view of the bicycle frame taken along line 14--14 of FIG. 7 further illustrating the increased ellipticity of the seat tube adjacent to its ends. 

The ornamental design for a bicycle frame, as shown and described. 